Windows 10 Anniversary Update common problems and how to fix them

Stuck installing the Windows 10 Anniversary Update? Here we show you the most common problems and how to fix them.
The Anniversary Update for Windows 10 is finally ready for download. The new version of the operating system is now slowly rolling out to over 350 million devices around the world.
This release means that during the roll out millions of users will be busy trying to install the new update on many devices, including desktop PCs, laptops, tablets, and (eventually) phones. Unfortunately, even though the Anniversary Update promises to be one of the best and most stable releases, building an operating system is a very complex task, as such it's expected that some users may come across errors, bugs, and other issues during and after the installation.
Although there could be some unknown issues during the rollout, remember that the problem is not always the operating system. Some other factors could be causing the problem, including outdated drivers, software conflicts, or certain custom configurations.